Tubular latch casing



Sept. 22, 1953 A. ERKKILA 2,653,046

' TUBULAR LATCH CASING Original Filed Feb. 7, 1946 4 Sheets-Sheet l l. QJ 9 @@/2 ff m um V/J 8 m A. ERKKILA TUBULAR LATCH CASING Spt. 22, 1953 4 sheets-sheet 2 Original Filed Feb. 7, 1946 E1 .54 2550 @y 5a 75 74 W lllllllnll INVENTOR ATTORNEY y SePt- 22, 1953 A. ERKKILA 2,653,046

TUBULAR LATCH CASING original Filed Feb. 7, 194e 4 sheets-sheet s ORNEY ATT Sept. 22, 1953 A. ERKKILA TUBULAR LATCH CASING 4 sheets-sheet 4 Original Filed Feb. 7, 1946 ILL-'3.15.

@ATTORNEY Patented Sept. 22, 1953 UNITED STATES PATENT FFICE TUBULAR LATCH CASING Andrew Erkkila, Fitchburg, Mass., assigner to `Independent Lock Company, Fitchburg, Mass., a corporation of Massachusetts 1 claim.

vmay be economically produced and assembled,

yet which satisfies alluthe requirements of unfailing performanceand rigidity of construction.

To attain these objects and :such further aob- `jects as may appear `iherein `or be hereinafter pointed out, I `.make referencer-,o 'the :accompany- :ing drawings, for-ming .a part hereof, .inwhich- Figure l is a-persp'e'ctive viewof any installation, shown in `'connection witha .'ragmentary jportion of -a door;

Figure 2 is a section taken :on the fline 2-,2 of

lFigure 1;

vFigure 3 is a section `=takenfonthe line ;3--\3 of Figure 2, with the-latch bolt :in the .projected position;

Figure 4 is-a `view.-sixrlilar toFigure 3with the latch bolt and roll aback..mechanism` retracting `the latch bolt;

Figure 5 is a sectionltaken on the line 5-5'of Figure 2;.

Figure 6 isa section-taken'onatheflineB-S of Figure 7 `isan exploded `perspective view of'my 'latch bolt assembly shown Figure 1;

Figure 8 is a .fragmentary perspective view of `the latch bolt shank heel;

Figure 9 is vasectiontakcnfon-thefline 9-9 :of

Figure 7;

`Figure l0 is a,sectiontaken..on vthe line Ill- I0 of Figure 2;

Figure 1l is a viewlcorresponding'to Figurer?, Yof another embodiment Iof myinvention with the lknob push button in the depressedposition;

Figure 12 is a. fragmentary "section taken on the line l2-l2 of"`"Figure, V11;

Figure 1'3 is a longitudinal sectional `lviewrof,

:another vembodiment 'of my invention;

VFigure 14 fis aMperspecti-veiview of fav casing in accordance with still anotherfembodimentLofmy invention;

Figure 15 'isY aLperspective View ofa detail;

Figure 416 is` aiperspective .view; of 4 the clogging lever in accordancewithfanother-:embodiment `of my invention;

Figure y.17 `^is Ya,.fragmentary l,.perspective. View of i still another Iembodiment Y:.of invention.

Making reference .to the drawings, I show a casing l0, of generally tubular cross-section, arranged to be fitted Within av boring il of a door l2. The casing comprises a section i3, which includes a rectangular portion l, having a locking slot l5 to receive the tongue l5 of the channel l1 formed .on the inner lamination lI8 of the end plate i9. In this construction, the end plate I9 may be of brass and the inner lamination I of iron. Screw holes '20 to receive the attaching screws 20a (Figure 1j) are defined by Vmaterial `spun from the :body ofthe plate iti, entering a complemental drill hole i2| in the lamination i8 (Figure 3) and headed thereover to unite plate i9 and lamination i8.

.The channel `Il forms a guide for the latch bolt 22, which channelis aligned with the aperture 23 in the end iplate .|9. The latch bolt 22 has screw-threadedlyconnected thereto a latch `bolts'hank 24 which isformed-with a heel portion 25, in which the end of the shank 2li is rigidly headed. A coiled spring `.26 is distended between the latchbolt 22and the heel 25.

Rearwardly Aof the casing I3, a spindle hub aperture 21 is formed by spinning the flange 23 therefromv inwardly directed, to form a bearing, and an inner seat 29 -for the rollback hub hereinafter described.

Guide fingers 30f3 -are positioned forwardly of the iiange 28 and Serve as an'abutment for the ,disk 3l, formed with pivots 32, 32 and oriiced at `38, and may include .spaced fingers 139, 39 outlining adepressedlug 40. .A lug 4l is struckup 4from thetongue'l, Lfor purposes .which willap.- `pear as this descriptionproceeds.

The rearmost-'portion of thesdogging lever 3Q 'includes an extension arm.42, bent laterally into a branch 543, carryinga.camming'edgeslli The outside spindle rollback'hub .45 isthereuponposi- -tioned to be journaledin theibearing `portionZliy centering the clogging lever`34. The flange @.3 carries the rollback camming arms l-l, :il Vbe- With this assembly-there is then provided the 3 retractor link 49 comprising spaced branches 50, 50, having guides on their inner edges 5|, 5| arranged to span the extension 52 of the hub 45. Spaced pins 53, 53 extend for a length to lie in the path of the rollback cams through each face of the branches 50, 50. The link 49 is formed with extensions 54, 54 comprising bearing shoes entering into the slides 55, 55, at the edge of the Acasing section I3. The link branches 58, 50 'are headed in the plate 56, formed with a bearing edge 51 for engaging the guides 58, 58 by inwardly indenting the metal of the casing section I3 t0 form longitudinally directed, embossed protuberances.

The plate 56 is formed with a keyhole slot 59, having a restricted entrance portion 60 which may span the slot or neck 6| of the shank 24. By spanning the neck 5I between the rearmost end of the spring 26, upon its compression the plate 56 may be made to span the cylindrical part of the shank 24 for slidable engagement thereupon. Upon the plate 56 passing through the neck 6|, and a quarter turn being made expansion 0f the spring 26 will normally direct the latch bolt 22 to the limit, to engage the iheel 25 as the limiting position, yet permitting independent movement of the latch bolt head 22 with respect to the link 49.

Under these conditions, the inside rollback and hub assembly 62 may now be placed in position. This latter hub has a seat 63 (see Figure 2) providing a bearing which may be journaled on the extension 52 of the hub 45. The hub 45 is formed with a keying orifice 64 of square cross-section, to receive in keying engagement the knob spindle hereinafter to be described. The hub 62, however, is oriced at 65 to receive and encirclethe square spindle for free rotation in relation thereto.

The hub 62 is formed with a rollback cam 66, having shoulders 61, 61 which may fall behind the pins 53, 53 on the upper face of the link 49. y

The assembly, in this condition, may have applied to it the casing section 68. This is provided with indentations 58, 58 as described in connection with the casing section I3, cooperating with the indentations 58 on the other casing to form a guide for the plate 56.

The forward end of the square channel I1 is provided with an oiset finger 69, cooperating with the slot 10 in the forward edge of the casing section 68, to maintain the casing sections I3 and 68 in alignment at the forward end, the edge 1| abutting the lamination I8 previously described.

The casing section 68 is likewise slotted with the slot 55 for the shoes 54, 54 on the link 50.

A boring 12, with an inwardly spun flange 13 provides a bearing for the extension 14', to maintain the hub 62 journaled therein for rotation. In this position, coiled springs 14, 14 are mounted upon the lugs 15, 15 at the rear of the link 49 and the spacer 16 xed thereover, to have the lugs 11, 11 pressed therefrom nest over the opposite free ends of the coiled spring 14. A cap 1B ts over the sleeve sections 19, 19 of the casing I3 and 68, respectively, to hold the casing sections together. An offset friction nger 80 is cut out from the side wall of the cap 18, to fall into the seat 8| in the rear sleeve portion 19 and the casing section I3, thus preventing displacement of the cap but being readily removable upon partial rotation to move the finger 80 from its position entering the slot 8|.

It will be observed that the dogging lever 34 has its camming end 44 accessible through the 4 orice 82, having an overhanging lip 83 on the casing section 68.

The casing I3 is provided with a boring 84, making the arm 42 accessible for purposes which will appear as this description proceeds.

With a casing assembled as described, I provide an interior knob assembly 85 which comprises a square knob spindle 86, which is directed through a sleeve 81 in a boring 98, within which the spindle may freely rotate. A cross pin 89 passing transversely through the end 90 of the spindle bears against the shoulder 9| of the sleeve 81, permitting rotation but otherwise holding the spindle against displacement from the sleeve 81. The sleeve 81 is formed with lugs 92, 92, complemental to the slots 93, 93 of the hub 62 for rotation of the hub 62 in a manner which will hereinafter appear.

A knob 94 is axially oriced at 95 to receive a push button 96 comprising a cup shaped member to seat within the same one end of a coiled spring 91. The opposite end of the coil 91 is housed over the head 90 of the spindle 86. The push button 96 carries riveted thereto an elongated normally laterally exed spring linger 98, extending through the tubular shank 99 in the knob and entering into a slot |00, formed in the neck |0| of the sleeve 81.

The shank 99 abuts a shoulder |02 on the sleeve 81, to hold the knob and sleeve 81 in the assembled limiting position. A set-screw |03 holds the sleeve and knob in assembled position. The free end of the nger 98 is maintained in an upward tilting position by the leaf spring |04, anchored in the slot |00 and bearing against the latching nose |05. A shoulder |06 on the shank of the nose |05 restrains the escape of the push button 96 by engagement of the said shoulder |06 with the rim of the shank 99. The push button 96 and its nger 98 are inwardly slidable, to direct the nose |05 into engagement with the camming end 44 of the clogging lever 34, entering through the orice 82.

The latching nose |05 is provided with a camming edge |01 and a locking lip |08. The action in depressing the push button serves rst to depress the latching nose |05 past the lug 83 of the casing, to become depressed in the slot |00, and thereafter to be held in the depressed latched position by engagement of the lip |08 with the lug 83. This thereby latches the push button in the depressed position against the action of the spring 91 to retract the arm 98.

For assembly of the latch in position, I rst slip an inside escutcheon |09 over the shank 99 of the inside knob and then project the spindle 86 through the hub 62 and into keying engagement with the square orifice 64 of the hub 45, until the end of the spindle passes through the boring |I0 on the outside face of the door. In this position, the end of the spindle is directed into the shank |I2 of the outside knob I|3 and locked in position by the set screw II4, after seating the shank |I2 in the outside escutcheon ||5. This outside knob is of conventional design to receive the square spindle II in keying engagement.

The operation of the clogging lever within the tubular latch will now be described.

Normally, the latch bolt 22 is spring projected and is independently depressible with its shank against the tension of the spring 26, as when the door is closed and the latch bolt strikes the strike plate and thereafter as it enters the usual strike plate orifice (not shown) the latch bolt is again in the projected position.

In the normal position of the dogging member 34, shown in dotted line in Figure 2, the inside knob, upon engaging the rollback 62, may retract the latch bolt 22 by engagement of the rollback E6 with the pins 53 on the front face of the link 50. Thus, clockwise or counterclockwise rotation of the inside knob will withdraw the latch bolt. Operation of the outside knob H3 may likewise be obtained in this position of the dogging lever as the spindle 86` will rotate the rollback 45. Where it is desired to dog the outside knob H3 to prevent retraction of the latch bolt, the push buttonL 96 is. depressed. This action directs the latching nose N35 through the oriiice 82, where it engages the camming portion 44 and somewhat slidingly tilts the camming lever about the pivots 32. This action in the normally` oriented position of the rollback 45 serves tov direct theflug 4| into the slot 48.

The tongue 31, being positioned against rotation between the guides 30, thereby effectively dogs the rollback l5Y against rotation. Detent means may be employed to maintain :the dogging lever in the tripped position.

In the embodiment illustrated in Figures 2 and 7, a detentil@ comprising a spring loaded ball housed in the guide 30 enters behind the rear face lll of the tongue 3l, as shown in Figure 2, to restrain the clogging lever in the dogged position. It will be observed that the latching nose l i5 has been held in the depressed.v position by the engagement of the shoulder Hitt'with the extension B3. The inwardly projected; position of the nose lilo. likewise maintains the tripping levery in the dogged position.

As an occupant rotates the inside knob at, the action is as follows: The inside rollback 55,02. the hub 62 being free to rotate on the square spindle which it encircles rotatably will engage a pin 53 and start the link 49 moving slidingly in the housing, notwithstanding the dogged condition of the hub 45, by reason of the lug 4l entering the slot 48. The slight movement of the link 49 draws with it the plate 56 and the latch-shank heel 25. This action serves to bring the heel eX- tension 25a into engagement with the camming portions 39, thereby tripping the clogging lever 34 clockwise (in the position shown in Figure 2, to the position shown in dotted line), thereby retracting the lug 4l from engagement with the slot '48 of the rollback on the hub 45, and releasing the spindle S5 for outside knob operation.

Should the inside push button 96 be depressed to have tripped the clogging lever 34 into the dogging position shown in Figure 2, for emergency purposes the escutcheon H5 is provided with an aperture 84a, aligned opposite the aperture 34 of the casing, whereby some instrument or a key operated member may enter the casing to trip the clogging lever 35, from the position shown in full lines in Figure 2, to that shown in dotted lines in Figure 2. Likewise, should accidental operation of the push button 96 occur to move the same to the dogging position with the door ajar the slamming of the door will serve to inwardly retract the latch bolt 22, as it strikes the strike plate of the door, depressing it and directing the heel 25 into engagement with the camming portion lli! of the tongue Si. This action accordingly resets the dogging lever 34, whereby outside knob rotation may be effected.

While I have described in connection with the embodiment of Figures l to a push button dog- 6 ging element actuating a spring 91, I' may operate the dogging trigger by a frictionally urged and positively returned camming nose without spring action in either movement.

In Figure 11, a knob sleeve 8l'- is employed, as previously described. In this case, the push button 96a carries riveted thereto a linger piece 98a, guided in the groove Ia. No spring means are employed between the head 9i!A of the spindle 8S and the push button 95a. The finger 960iv has a nose 355e, with a camming portion ila arranged upon rotation to engage the camming edge of the dogging trigger 44, as in the prior embodiment. A shoulder Hita engages the lip i380: of the casing, to limit the inward projection of the nose l5a, to trip the clogging triggerY by engagement with the portion Upon rotation of the knob 94a, the retractor link 4S will draw the plate 5S with it, to cam the clogging lever 34- back to its initial position shown in dotted line in Figure 1l. This serves to press the nose liia outwardly to reset the push button 95a. It is understood that a rectilinear spring iti-ia warped outwardly engages the shank 93a of the knob, to frictionally hold the push button and its actuating assembly in either the clogging position or re-set position.

In still another embodiment oi my invention, as illustrated in Figure 13, I may provide greater tolerances in the operation of the clogging lever. This I accomplish by making the clogging lever 34a with the camniing nosel 39a simply by deflecting the nose thereof from the branch 31a. In this construction, the shank 24 is provided with a heel 25D, having* angularly directed camming faces 25C. In thisway, appropriatedeection of the dogging lever 34d may be secured. Lateral guidance, such` as by providing the. spaced lingers Se, 3Q in the previous embodiment need not be here employed. l y

The dogging lever in this particular case eX- tends rearwardly, to have its branch 42a extend adjacent the casing ends ld, at which point it contacts a curved leaf detent spring lla, riveted on the capping plate 15a. The plate 15a has tongues 'lla entering into complemental orifices in the front and rear casing, acting as abutments for the springs 14a. Seats ilb retain the springs 74o against lateral displacement.

The fold of the branch 42a at its extreme point is provided with an embossing, bead-like construction l lla, cooperating with the detent spring lita to retain the clogging lever tripped in the dogged or undogged position.

The casing in this particular case is closed by a cap 18a formed with bayonet slots 80a engagingl the extruded bosses lila. In this embodiment a separate pivot plate need not be employed but the sheet metal casing has embossed thereon the protuberances 32a about which the dogging lever tilts or rocks.

Another embodiment of my invention is illustrated in Figure 14 wherein one half of the casing l3b is shown. Longitudinal guides 58, 58 are pressed inwardly or embossed in the sheet metal of the casing and terminate in embossings Sub, 30h, acting as abutments for the disks 3Ib carrying the pivots 32h as in the prior embodiment. In all other respects, the casing segment |312 may be formed as in the prior embodiments.

In accordance with this embodiment, a detent spring l i619 of general L-shape has one branch attached to the sleeve sections leb, serving to bear against a clogging trigger, as illustrated in Figures 13 and 16, cooperating with the bead I Ila aesae thereof to restrain the lever 34a in either of the tripped positions, i. e. clogging or freeing the rollback hub 45a.

In all other respects, the function of the parts is in accordance with the prior embodiments illustrated in Figures 1 to 10.

In Figure 17 there is exemplified a form of latch bolt operation whereby the latch bolt is positively dogged, as well as to dog the outside knob and the spindle controlled thereby. Here the latch bolt shank 24e is provided with a heel portion 25e of rectangular contour, exposing an abutting end 25d.

In this embodiment, the clogging lever 34h is actuated as in the prior embodiments. However, the branch 31h terminates in a clogging finger 39h. This dogging finger is extended so that normally it lies outside of the path of movement of the shank heel 25e as well as the plate 56. When the dogging lever 34h is tripped into dogging position, the dogging finger 39h lies in the path of the heel 25e to engage the abutting surface 25d, Under these circumstances, the possibility of jimmying or prying of the latch bolt carried by the shank 24e to the retracted position is minimized, although the automatic re-setting feature heretofore described is not obtained in this form of construction.

The feature just described indicates the versatility of my construction to obtain a tubular latch which may be employed to latch communicating doors, such as bathroom doors, as well as for exterior entrance doors which may require key operation for the exterior knob.

1t will be observed that I have described a latch bolt assembly which may be made economically and by simple assembly means, satisfying all the requirements of rigidity of construction and positiveness of operation for its intended purpose, all combined with a push but- 8 ton control located in the knob and employing, in its preferred form, a one-piece spindle, assuring simplicity of installation and long life in operation.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is:

In a casing for a tubular lock comprising a pair of complementary, parti-tubular sheet metal segments joined to each other in longitudinal edge contact, a latch bolt projectible through one end of the casing, said latch bolt having a shank inwardly guided within said casing, the combination therewith of an end plate on which said segments are supported, said end plate comprising a pair of sheet metal members comprising a face member and a back member, each having bolt apertures in alignment, the bolt aperture of the back member being outlined by struck-up webs integral with the back member defining a bolt guide having side and upper and lower bearing surfaces for the shank of the bolt, a tongue outwardly struck up from each of said side webs, each of said casing segments having a slotted edge engaging said web and tongue to envelope and lock the casing segment to the web and in abutting contact with said back member.

ANDREW ERKKILA.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 503,400 Biggs Aug. 15, 1893 552,868 Donahue Jan. 7, 1896 1,505,380 Dexter Aug. 19, 1924 1,779,410 Dexter Oct. 28, 1930 2,238,066 Mantz Apr. 15, 1941 2,454,145 Erkkila Nov. 16, 1948 

